<template>
  <van-pull-refresh v-model="isRefreshing" @refresh="refreshFilmList" v-if="filmList.length > 0">
    <van-list v-model="isLoading" :finished="isFinished" finished-text="我是有底线的" :offset="100" :immediate-check="false"
              @load="loadingFilmList">
      <ul class="film-list" v-for="(film, index) in filmList" :key="film.filmId">
        <li class="film-list-item" @click="$router.push(`/film/${film.filmId}`)">
          <ul>
            <li class="film-img">
              <img :src="film.poster" :alt="film.name" />
            </li>
            <li class="film-info">
              <ul>
                <li class="film-title">
                  {{ film.name }}<span>{{ film.filmType.name }}</span>
                </li>
                <li class="film-grade" v-show="type === 1">
                  观众评分<span>{{ film.grade ? film.grade : "无" }}</span>
                </li>
                <li class="film-actors">
                  主演：{{ formatActors(film.actors) }}
                </li>
                <li class="film-nation-runtime">
                  {{ detailList[index] }}
                </li>
                <li class="film-premiere-time" v-show="type === 2">
                  上映日期：{{ formatDate(film.premiereAt * 1000) }}
                </li>
              </ul>
            </li>
            <li class="btn" :class="btnColor" v-if="film.isPresale"
                @click.stop="$router.push(`/film/${film.filmId}/cinemas`)">
              {{ btnText }}
            </li>
          </ul>
        </li>
      </ul>
    </van-list>
  </van-pull-refresh>
</template>

<script>
import { List, PullRefresh } from 'vant'
import { mapState } from 'vuex'
import { http, load, formatDate, getTimestamp } from '@/utils'

export default {
  name: 'FilmList',
  components: {
    [List.name]: List,
    [PullRefresh.name]: PullRefresh
  },
  props: {
    type: {
      type: Number,
      default: 1
    }
  },
  data () {
    return {
      filmList: [],
      pageNum: 1,
      total: 0,
      isLoading: false, // 是否正在加载中
      isFinished: false, // 是否全部加载完成
      isRefreshing: false // 是否处于下拉刷新状态
    }
  },
  computed: {
    ...mapState('CityModule', ['cityId']),
    btnText () {
      return this.type === 1 ? '购票' : '预购'
    },
    btnColor () {
      return this.type === 1 ? 'buy-btn' : 'pre-btn'
    },
    // 将详情信息计算成数组
    detailList () {
      const arr = []
      this.filmList.forEach((film) => {
        const nation = film.nation ? film.nation : '未知地区'
        const runtime = film.runtime ? film.runtime : '--'
        arr.push(`${nation} | ${runtime}分钟`)
      })
      return arr
    }
  },
  methods: {
    // 加载电影列表
    loadingFilmList () {
      // 若数据全部加载完成，且不是下拉刷新状态，设置 isFinished 属性为 true
      if (this.filmList.length >= this.total && this.filmList.length !== 0 && this.isRefreshing === false) {
        this.isFinished = true
        this.isLoading = false
        return
      }
      this.pageNum++
      http({
        url: `/gateway?cityId=${this.cityId}&pageNum=${this.pageNum}&pageSize=10&type=${this.type}&k=${getTimestamp()}`,
        headers: { 'X-Host': 'mall.film-ticket.film.list' }
      })
        .then((res) => {
          // 如果处于下拉刷新状态 清空列表数据，重置加载状态，重新加载数据
          if (this.isRefreshing) {
            this.filmList = []
            this.isRefreshing = false
          }
          // 追加电影列表到现有数组
          this.filmList = [...this.filmList, ...res.data.data.films]
          // 再执行一次检查，如果 this.filmList 的初始长度就是0，则不再加载数据
          if (this.filmList.length === 0) {
            this.isFinished = true
          }
          this.total = res.data.data.total
          // 加载完成后，调置 isLoading 为 false
          this.isLoading = false
        })
        .catch((err) => {
          console.warn(err)
          this.isLoading = false
        })
    },
    // 下拉刷新时，清空列表数据，重置加载状态，重新加载数据
    refreshFilmList () {
      this.isFinished = false
      this.isLoading = true
      this.pageNum = 0
      this.loadingFilmList()
    },
    // 格式化演员名单
    formatActors (actors) {
      if (typeof actors !== 'object') return '暂无主演'
      return actors.map((actor) => actor.name).join(' ')
    },
    // 格式化日期
    formatDate (milliseconds) {
      return formatDate(milliseconds)
    }
  },
  mounted () {
    load({
      url: `/gateway?cityId=${this.cityId}&pageNum=${this.pageNum}&pageSize=10&type=${this.type}&k=${getTimestamp()}`,
      headers: { 'X-Host': 'mall.film-ticket.film.list' }
    })
      .then((res) => {
        this.filmList = res.data.data.films
        this.total = res.data.data.total
      })
      .catch((err) => {
        console.warn(err)
      })
  }
}
</script>

<style lang="scss" scoped>
.film-list-item {
  border-top: 2px solid #f9f9f9;
  cursor: pointer;
}
.film-list-item > ul {
  display: flex;
  padding: 15px;
  align-items: center;
  .film-img {
    width: 66px;
    height: 94px;
    img {
      width: 100%;
      height: 100%;
    }
  }
  .film-info {
    width: calc(100% - 136px); // 自动计算宽度
    height: 94px;
    margin: 0px 10px;
    font-size: 13px;
    color: #797d82;
    ul {
      height: 100%; // 必须指定，否则 justify-content 不生效
      display: flex;
      flex-direction: column;
      justify-content: space-evenly;
    }
    .film-title {
      font-size: 16px;
      color: #191a1b;
      display: flex;
      align-items: center;
      span {
        font-size: 9px;
        color: #fff;
        background-color: #d2d6dc;
        height: 14px;
        line-height: 14px;
        padding: 0 2px;
        border-radius: 2px;
        margin-left: 5px;
      }
    }
    .film-grade span {
      font-size: 14px;
      color: #ffb232;
      margin-left: 5px;
    }
    li {
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
    }
  }
  .btn {
    width: 50px;
    height: 25px;
    font-size: 13px;
    text-align: center;
    line-height: 25px;
    border: 1px solid;
    border-radius: 3px;
    background: white;
  }
  .buy-btn {
    color: #ff5f16;
  }
  .pre-btn {
    color: #ffb232;
  }
}
</style>
